Knee brace



FIG. 1 is a front perspective view of a knee brace showing my new design;

FIG. 2 is a front view of the knee brace;

FIG. 3 is a back view of the knee brace;

FIG. 4 is a left side view of the knee brace;

FIG. 5 is a right side view of the knee brace;

FIG. 6 is a top view of the knee brace; and,

FIG. 7 is a bottom view of the knee brace. 

The ornamental design for a knee brace, as shown and described. 